title: [Political and organizational challenges in the Brazilian Unified National Health System: twenty years of public policy].
authors.forename: Gastão Wagner de Sousa
authors.initials: GW
authors.lastname: Campos
mesh_terms: D001938:Brazil; D015331:Cohort Studies; D003695:Delivery of Health Care / Q000191:economics / Q000592:standards; D018166:Health Care Reform; D006801:Humans; D009313:National Health Programs / Q000191:economics / Q000458:organization & administration* / Q000592:standards